Sudroid Z18 Android 4.4 Mini Water and Dust-proof Cellphone with Dual Sim Card Slots Unlocked (Orange) Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin. SIM Card Quantity: Dual SIM Mini size: 48 x 88 x 12.8 mm Support: Play Store RAM:512MB ROM:4GB